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Finding the Fourth Proportional to 67.87, 101.24 and 57.11

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Solution

The fourth proportional to 67.87, 101.24 and 57.11 is: 85.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.87 : 101.24 = 57.11 : x
  2. Step 2: Convert to fraction form
    67.87/101.24 = 57.11/x
  3. Step 3: Cross multiply
    67.87x = 101.24 × 57.11
  4. Step 4: Simplify right side
    67.87x = 5,781.24
  5. Step 5: Solve for x
    x = 5,781.24/67.87
  6. Step 6: Final answer
    x = 85.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.